The British tourists who reportedly has a grenade thrown at them in Kenya were travelling in a van from Diani in Kwale to Mombasa when it was targeted as it slowed down, police told the Kenya-based Standard Digital.
"He vanished soon after he hurled the explosive," police chief Robert Kitur told the paper.
The grenade failed to explode and is being examined by police.
The attack comes on the same day Kenya celebrates 50 years of independence from British colonialist rule.
More top news
Portman was due to receive the award in Israel in June and said that her reasons for skipping the ceremony were solely due to Mr Netanyahu.
Analysis of Department for Work and Pensions data found the average man receives £153.86 a week and the average woman receives £125.98.
The country says it is making the move to shift its national focus and improve its economy.